Vehicle seat device

Abstract

A vehicle seat device is designed to perform tilt adjustment of a seat cushion in a construction which is high in rigidity, downsized and high in the quality of external appearance. The device comprises rotational links; floor attached front brackets and front swing links which make couplings between first joint portions of the rotational links and upper rails; flank brackets coupled to the rotational links at front portion thereof; floor attached rear brackets and rear swing links which make couplings between rear portions of the flank brackets and the upper rails; a front drive device secured to one of the flank brackets for rotationally driving the rotational links; and cushion frames coupled to the flank brackets and second joint portions of the rotational links respectively at rear portions and front portions thereof. The second joint portions and the cushion frames are coupled to respective both ends of cushion frame swing links.

1. A vehicle seat device comprising:
 flank brackets adapted to support a seat cushion and rotatably coupled at rear portions to floor attached rear brackets; 
 rotational links rotatably supported at center portions on front portions of the flank brackets; 
 a front drive device for relatively rotating the rotational links relative to the flank brackets; 
 cushion frames for the seat cushion, having rear end portions rotatably coupled to center portions of the flank brackets and having front end portions coupled to second joint portions ahead of the center portions of the rotational links to be restricted from movement in a vertical direction relative to the rotational links and to be relatively movable in a forward-rearward direction; and 
 floor attached front brackets having one end coupled to first joint portions behind the center portions of the rotational links to be restricted from movement in the vertical direction relative to the rotational links and to be relatively movable in the forward-rearward direction. 
 
     
     
       2. The vehicle seat device described in  claim 1 , wherein the second joint portions and the cushion frames are relatively rotatably coupled through cushion frame swing links. 
     
     
       3. The vehicle seat device described in  claim 1 , wherein the first joint portions and the floor attached front brackets are relatively rotatably coupled through front swing links. 
     
     
       4. The vehicle seat device described in  claim 1 , further comprising:
 rear swing links rotatably coupled at one ends to the rear portions of the flank brackets and rotatably coupled at the other ends to the floor attached rear brackets in order to rotatably couple the rear portions of the flank brackets to the floor attached rear brackets; and 
 a rear drive device for relatively rotating the rear swing links relative to the flank brackets. 
 
     
     
       5. A vehicle seat device comprising:
 flank brackets adapted to support a seat cushion and rotatably coupled at rear portions to floor attached rear brackets; 
 rotational links rotatably supported at center portions on front portions of the flank brackets; 
 a front drive device for relatively rotating the rotational links relative to the flank brackets; 
 cushion frames for the seat cushion, having rear end portions rotatably coupled to center portions of the flank brackets and having front end portions coupled to second joint portions ahead of the center portions of the rotational links to be restricted from movement in a vertical direction relative to the rotational links and to be relatively movable in a forward-rearward direction; 
 floor attached front brackets having one end coupled to first joint portions of the rotational links behind the center portions of the rotational links to be restricted from movement in the vertical direction relative to the rotational links and to be relatively movable in the forward-rearward direction; 
 rear swing links rotatably coupled at one ends to the rear portions of the flank brackets and rotatably coupled at the other ends to the floor attached rear brackets in order to rotatably couple the rear portions of the flank brackets to the floor attached rear brackets; and 
 a rear drive device for relatively rotating the rear swing links relative to the flank brackets; 
 wherein the rear drive device is configured to relatively rotate the rear swing links relative to the flank brackets in connection with the operation of the front drive device. 
 
     
     
       6. The vehicle seat device described in  claim 5 , wherein the rear drive device is configured to operate in connection with the operation of the front drive device to diminish the vertical movements of coupling portions between the rear end portions of the cushion frames and the flank brackets. 
     
     
       7. The vehicle seat device described in  claim 1 , wherein the center portions of the flank brackets where the cushion frames are rotatably coupled are spaced at a distance horizontally from the rear portions of the flank brackets that are rotatably coupled to the floor attached rear brackets. 
     
     
       8. The vehicle seat device described in  claim 1 , wherein the rear portions of the flank brackets are rotatably coupled to the floor attached rear brackets by way of rear swing links which are rotatably supported on the flank brackets at first support pins, the rear end portions of the cushion frames being rotatably coupled to the center portions of the flank brackets by second supporting pins which are positioned ahead of the first supporting pins. 
     
     
       9. A vehicle seat device comprising:
 flank brackets adapted to support a seat cushion and having rear portions rotatably coupled at first support pins to floor attached rear brackets; 
 rotational links rotatably supported at center portions on front portions of the flank brackets; 
 a front drive device for relatively rotating the rotational links relative to the flank brackets; 
 cushion frames for the seat cushion, the cushion frames having rear end portions rotatably coupled to center portions of the flank brackets at second support pins positioned ahead of the first support pins, the cushion frames having front end portions coupled to second joint portions of the rotational links ahead of the center portions of the rotational links to be restricted from movement in a vertical direction relative to the rotational links and to be relatively movable in a forward-rearward direction; and 
 floor attached front brackets having one end coupled to first joint portions behind the center portions of the rotational links to be restricted from movement in the vertical direction relative to the rotational links and to be relatively movable in the forward-rearward direction. 
 
     
     
       10. The vehicle seat device described in  claim 9 , wherein the second joint portions and the front end portions of the cushion frames are relatively rotatably coupled by cushion frame swing links. 
     
     
       11. The vehicle seat device described in  claim 9 , wherein the first joint portions and the floor attached front brackets are relatively rotatably coupled by front swing links. 
     
     
       12. The vehicle seat device described in  claim 9 , further comprising:
 rear swing links rotatably coupled at one ends to the rear portions of the flank brackets by the first support pins and rotatably coupled at the other ends to the floor attached rear brackets to rotatably couple the rear portions of the flank brackets to the floor attached rear brackets; and 
 a rear drive device for relatively rotating the rear swing links relative to the flank brackets.